Tuning indicator system



Nov. 4, 1941- R. Kl-:BLusEK ET Ax.'l

TUNING INDICATOR SYSTEM Filed Aug. 5, 1939 ao H n 2 o0 S W LV.. R7. Y oKE THB N R L E H o nllqhwlnlllllnuul m0 .T FmHI. We T wl|||J IKA A r0` DNl/ I 1 1 R A :a: HA Q ml. p S C Il I m U H 3: 1 \I L: i Y: Y 1 5 B 2 9 Lo 4 f 2 H 5; x n T llllll 59 w f Patented Nov. 4, 1941 UNITED STATI-:sPATENT OFFICE 2,261,386 TUNING INDICATOR SYSTEM Application August s,1939, sensi No. 283,532 En the Netherlands September 3, 1938 6 Claims.

This invention relates to a wireless receiving set comprising a tuningdevice having a plurality of main dials for the various wave lengthranges.

This set is characterised in that it comprises for one or more bandsfrom one or more wave length ranges particular auxiliary dials whichareassociated with one or more auxiliary pointers and which aresubstantially longer than the corresponding bands on the main dials andthrough the cooperation of a screen moving relatively in relation to thetuning device the auxiliary pointer or pointers is or are only visiblewhen the main pointer or pointers cooperates or cooperate with a dialcontaining the bands under consideration.

A tuning device of this kind may be used with advantage in wirelessreceiving sets comprising means for the obtainment of the so-called bandspreading.y Such sets comprise means for enlarging, so to speak, a givenwave-band. If a mainpointer of the set on one of the main dialsindicates a. given band, an auxiliary pointer in the set in cooperationwith one of the auxiliary dials permits of effecting this tuningaccurately. As a rule, the band-spreading means will alone be used inthe ultra-short wave region. 'When 25 in this latter case tuning iseiiected in the medium wave or long wave range, the auxiliary dials yvided in the set. It is, of course, possible to cause the screen deviceto move relatively to the stationary tuning device but preference willgenerally be given to movable arrangement of the tuning device and toarranging for the nontransparent parts of the set which surround awindow in the set to serve as a screening device.

In a favorable embodiment of the set according to the invention the mainand auxiliary dials are rectilinear and arranged parallel to each other.It is, of course, also possible to form them into a curved shape. Inorder to eiiect tuning as accurately as possible it is preferable,according to the invention, that the auxiliary dialsl should extendthroughout the length of the main dials. K

From a constructional point of view it is simple to mount the main andauxiliary dials all on a movable device used in common suchas a slide, adrum, a iilm or the like which is partly visible through a window in theset, the device or. devices carrying the main and auxiliary pointer lorpointers. being so coupled to the device carrymg (Cl. 11G-124.1)

is or are only visible if the main dials `iointly with the associatedauxiliary dials appear in front of the window. n l

VIn a further favorable form of construction of the wireless receivingset according to the invention the movement of the wave length switchhas the eii'ect of moving the device carrying the dials and the frame ofthe pointers to the desired position.

In order that the invention may be clearly unexhibits the dial, Fig. 1being a sectional view taken on the line I-I of Fig. 2, Fig. 2 being afront elevation, and Fig. 3 being an enlarged pargg tial view of Fig. 2showing only the scales and pointers which are viewable through thepanel window when the receiver is operated in the short-waver range.

The Wall I of the cabinet has formed in it a window 2. At the back ofthe wall I there are two vertical guides 3 on which a frame comprisingbars4 'and 5 is adapted to slide by means of sleeves 6, "I, 8, and 9,said frame carrying a plate Ill which has the various main and auxiliary30 dials mounted on it. This frame carries in addition a guide II forthe auxiliary pointer I2. The frame provided with the plate I0 and theauxiliary pointer I2 can be raised and lowered by '35 a slot 24 of thecabinet.

The guides 3 have in addition mounted on them a further frame'whichcomprises barsA I3 and I4 and is adapted to slide on the guides 3 b .vmeans of sleeves I5 and I6. The bar I3 serves as a '40 guide. for themain pointer 29. 'I'he sleeves I5 and .IS are provided `with anextension 25 and 2l engaging blocks 26 and 28 arranged to be stationaryin the cabinet. The cooperation of the extensions 25 and 21 with theblocks 26 and 28 45. has the effect of determining the lowest position Yof the frame of the main pointer 29.

The plate' I0 has dials I'I, I8, I9, 20, 2l and 22 mounted on it. Thedials I1, I8 and'l9 serve for the long-wave, medium-wave andultra-short- 50 wave regions. There is a difliculty in tuning stationsin the ultra-short-wave range since a comparatively great number ofstations are included in a. small number of narrow-bands. These bandsare indicated in Figs. 2 and 3 by small black `blocks on the dial I9.The fact that the set comprises band-spreading means permits of one ormore of these bands being extended over a much larger region. For thisreason the device according to the invention comprises the auxiliary thedials that the auxiliary pointer or pointers 00 dials 20, 2| and 22 forthe bands 30, 3| and Ma.

and the auxiliary dials 20, 2l and 22 becomel visible. Simultaneously,the sleeves 6.` and I of the frame of the plate l have raised thesleeves l and I6 of the frame of the main pointer 2O to such extent thatthis main pointer cooperates with the ultra-short-wave dial Il. Due tothe displacement of the plate l0 the auxiliary pointer I2 has beenraised simultaneously and. as shown in Fig. 3, it extends in front ofthe auxiliary dials 20, 2| and 22. ,Near the wave band to which thepointer 29 points is shown a given range which corresponds with theauxiliary dial 20. Obviously, this arrangement leads to the advantagethat the auxiliary dials and auxiliary pointer are only visible whentuning is efi'ected in the ultra-short-wave region.

What we claim is:

1. A tuning indicator for a radio receiver of the type capable of beingtuned to a plurality o! wave-length ranges including a short-wave range,comprising a member having formed thereon a plurality of main scaleseach corresponding to one of said ranges and a plurality of 'auxiliaryscales each corresponding to only a portion oi.' the scale of theshort-wave range, a main pointer adapted to selectively cooperate withall of the rst mentioned plurality of main scales or with said scalesexcept that of the shortwave range, and an auxiliary pointer adapted tocooperate with said auxiliary scales.

2. A tuning indicator for -a radio receiver of the type capable of beingtuned to a plurality ot wave-length ranges including a short-wave range,comprising a slidable member carrying a plurality of main scales eachcorresponding to one except that for the short-wave range, an auxiliarypointer adapted to cooperate with said additional scales, a panel of thereceiver provided with an aperture and means so constructed and arrangedfor adjusting the scale carrying member and the pointers relatively tothe panel aperture that when the receiver is adjusted to receivewave-lengths other than short-waves only the scales corresponding tosaid wave-lengths and the mainpointer are viewable through the panelaperture, whereas when the receiver is adjusted to receive short-waves,the short-wave range scale. the additional scales and the main andauxiliary pointers are viewable through the panel aperture.

-5. A tuning indicator system for a radio receiver of the type capableof being' tuned to a plurality of wave-length ranges including ashort-wave range and provided with band-spread mechanism when operatedin the last mentioned range, comprising a member carrying a plurality ofscales each corresponding to one of said ranges and a plurality ofadditional scales each corresponding t0 a predetermined and differentportion of the short-wave range scale. a main pointer adapted undercertain conditions of operation of the receiver to cooperate with theilrst mentioned plurality of scales and under other conditions tocooperate with said scales except that for the short-wave range, anauxiliary pointer operativelyvassociated with the bandspread mechanismand adapted to cooperate with said additional scales,va panel of thereceiver provided with an aperture and means so constructed and arrangedfor adjusting the scale carrying member and the pointers relatively tothe panel aperture that when the receiver is adjusted to receivewave-lengths other than short-waves only the scales corresponding tosaid wavelengths;`and the main pointer are viewable through the -panelaperture,V whereas when the of said ranges, a plurality of auxiliaryscales also carried by said slidable member and each corresponding toonly a portion of the scale of the short-wave range, a main pointer inone position of the slidable member adapted to cooperate with all of theilrst mentioned plurality of main scales and in a second position otsaid member adapted to cooperate with-said scales except that of theshort-wave range, and an auxiliary pointer adapted to cooperate withsaid auxiliary scales.

3. A tuning indicator as defined in claim 2 wherein the receiver isprovided with a panel having a viewing window, the slidable member beingpositionedbehind said window and adjustable to selectively expose theshort-wave scale and the auxiliary scales or the main scales exclusiveof the short-wave scale.

4. A tuning indicator system for a radio receiver of the type capable ofbeing tuned to a plurality of wave-length ranges including a shortwaverange, comprising a member c a plurality of scales each corresponding toone of said ranges and a plurality of additional scales eachcorresponding to a predetermined and different portion of the short-waverange scale.,a main pointer adapted under certain conditions ofoperation of the receiver to cooperate with the first`mentionedplurality of scales and under other conditions to cooperatewith said scales receiver is adjusted to receive short-waves, theshort-wave range scale, the additional scales and the main and auxiliarypointers are viewable through the panel aperture.

6. A tuning indicator system for a radio receiver of the' type capableof being tuned .to at least a long-wave range and a short-wave range,comprising a member carrying a plurality of par allelly-arranged scaleseach corresponding to one of said ranges and a plurality of auxiliaryscales each corresponding to a predetermined and.` diiferent portion ofthe short-wave range scale, a main pointer adapted under certainconditions of operation of the receiver to cooperate with the long-waveand the short-wave scales and under other conditions to cooperate withonly said longwave scale, an auxiliary pointer adapted to cooperate withsaid auxiliary scales. a panel of the receiver provided with an apertureand. means so constructed and arranged for adjusting the scale'carryingmember and the pointers relatively to the panel aperture that when thereceiver is adjusted to receive long wave-lengths only the scalecorresponding to said wave-lengthsand the main .pointer Iare viewablethrough the panel aperture, whereas when the receiver is adjusted'

